UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 The number of shares of common stock outstanding as of the close of business on July 31, 2019: 2,560,374,643 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ______ to ______ Commission File No. 1-6571 Merck ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Emerging growth company ☐ Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock ($0.50 par value) MRK New York Stock Exchange 1.125% Notes due 2021 MRK/21 New York Stock Exchange 0.500% Notes due 2024 MRK 24 New York Stock Exchange 1.875% Notes due 2026 MRK/26 New York Stock Exchange 2.500% Notes due 2034 MRK/34 New York Stock Exchange FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 ...

As filed with the Securities and Exchange Commission on February 27, 2019 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 _________________________________ FORM 10-K (MARK ONE) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2018 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 1-6571 ________________________ ...